6 Suggested Answers

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You need to loosen the motor mount slightly--just a full turn or two. Place a jack under the oil pan and lift the engine until the strain is relieved on the motor mount and finish removal. Replacement installation is the opposite except you'll want to tighten the new motor mount into place fully (if possible) before lowering the jack.

If the sensor is bad it causes the computer to change air/fuel mixture for the fuel injection and would have that effect,other possible causes would be a clogged fuel filter or the fuel pump is going bad but you need to change the map sensor if it is sending a code.

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It depends.. If your car is misfiring then it's probably the injectors or coil pack. If it's just nothing happening when you press the accelerator pedal, then it's probably the throttle potentiometer at fault. It could also be a blocked fuel filter. Take it to your local garage and get them to plug in a code machine - that will almost certainly highlight the fault.

Here is the definition. You may need to have someone check the accelerator pedal position sensor and the circuit.

P2138 NISSAN Description
The Accelerator Pedal Position (APP) sensor is installed on the upper
end of the accelerator pedal assembly. The sensor detects the
accelerator position and sends a signal to the Engine Control Module
(ECM).Accelerator pedal position sensor has two sensors. These
sensors are a kind of potentiometers which transform the accelerator
pedal position into output voltage, and emit the voltage signal to the
ECM. In addition, these sensors detect the opening and closing speed
of the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from these
signals and controls the throttle control motor based on these signals.Idle
position of the accelerator pedal is determined by the ECM receiving
the signal from the accelerator pedal position sensor. The ECM uses this
signal for the engine operationsuch as fuel cut. Read more: http://engine-codes.com/p2138_nissan.html#ixzz26J3D2x8s